ashtech DG16 Reference Manual page 225

Table 7.10. $PASHR,MIS Response Format for Message Type 1
Field
unsigned short
VDOP
unsigned short
ModZCnt
float GloTimeShift
unsigned long
GpsNavFlags
signed short
GeoidalSeparation
unsigned short
HDOP
unsigned short
VDOP
unsigned short
ModZCnt
float
GloTimeShift
Raw Data Commands
Length
(bytes)
2 VDOP multiplied by 100.
2 Modified Z-count (with a resolution of 0.2 seconds and an
acceptable range of 20 minutes) from the RTCA Type 1 message
containing the differential corrections used in the position
computation.
4 Current GLONASS time shift relative to GPS time in
microseconds, ranging from 0.0000 to +/-5000000.0000us.
4 Each bit is a "GPS Nav Flag" for a GPS satellite. The most
significant bit corresponds to PRN 32. When navigation data is
collected from a GPS satellite, a GPS Nav Flag bit is set for any
of the following reasons:
• User Range Accuracy (URA) Flag ("accuracy alert", bit 18 of
the Hand-Over-Word (HOW)) is set (ref. paragraph 2.4.2.2 of
GPS SPS Signal Specification);
• Failure of parity on 3 successive words of the navigation data;
• All data bits in subframe 1, 2 or 3 are 0's;
• Default navigation data (alternate 1's and 0's) is transmitted in
words 3 through 10 of subframe 1, 2 or 3 for that satellite (ref.
paragraph 2.4.1.3 of GPS SPS Signal Specification).
2 Geoidal separation in meters multiplied by 100.
2 HDOP multiplied by 100.
2 VDOP multiplied by 100.
2 Modified Z-count (with a resolution of 0.2 seconds and an
acceptable range of 20 minutes) from the RTCA Type 1 message
containing the differential corrections used in the position
computation.
4 Current GLONASS time shift relative to GPS time in
microseconds, ranging from 0.0000 to +/-5000000.0000us.
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